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Nanocracks upon Fracture of Oligoclase

Authors
  • Vettegren, V. I.1, 2
  • Ponomarev, A. V.1
  • Mamalimov, R. I.1, 2
  • Shcherbakov, I. P.2
  • 1 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, 123242, Russia , Moscow (Russia)
  • 2 Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia , St. Petersburg (Russia)
Type
Published Article
Journal
Izvestiya, Physics of the Solid Earth
Publisher
Pleiades Publishing
Publication Date
Nov 01, 2021
Volume
57
Issue
6
Pages
894–899
Identifiers
DOI: 10.1134/S1069351321060112
Source
Springer Nature
Keywords
Disciplines
  • Article
License
Green

Abstract

Abstract—The spectrum of fractoluminescence (FL) upon fracture of the surface of oligoclase is obtained. The analysis of the spectrum has shown that fracture of crystals leads to the formation of electronically excited free radicals ≡Si−O• and Fe3• ions as well as electron traps. FL consisted of a set of the signals with the intensities varying by an order of magnitude. The duration of the signals was ~50 ns and the time interval between them varied from ~0.1 to 1 μs. Each signal contained four maxima associated with the destruction of barriers preventing the motion of dislocations along the sliding planes. These breakthroughs cause the formation of the smallest (“primary”) cracks. All other, larger cracks are formed by the coalescence of the “primary” cracks. The sizes of “primary” cracks range from ~10 to 20 nm and the time of their formation is 16 ns. The distribution of cracks by size (surface areas of crack walls) is power law with the exponent –1.9.

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